The story explores the intense fear of being buried alive, a common phobia during the 19th century. The narrator, who suffers from catalepsy, a condition that can mimic death, becomes obsessed with the idea that he might be mistakenly interred while still alive. He recounts various real-life cases of premature burials and describes the elaborate precautions he takes to prevent such a fate for himself. Ultimately, the narrator's fears are confronted in a harrowing experience that leads to a profound realization about life and death.